If you deleted the site you now want back, it cannot be done. Once you delete a site/URL it is gone forever. There were clear warnings not only in the delete site page, but in the confirmation email that you received that deleting a site was permanent.

You will have to create a new site with a different name, perhaps a variation on the original name.

If your delete the site then the notice would say that. It takes 3 warnings to delete a site and the URLs are never recycled. So as you have a "reserved" notice you did not delete it. If and only if the reserved site is the same one as your username ie. the matching blog then you may contact Staff by email [email redacted] to obtain it.

When we create an account here the unique identifier is the email address we use. If you still have that sign on information for that blog under another username then that's one thing but if you don't it's another.
See here > http://en.support.wordpress.com/email-address/

How would you like it if you have not registered a blog with a URL of ritafresh.wordpress.com and I come in and register that blog URL and put adult material all over it? People would then mentally link you with my adult related site and you would be seriously upset and demand that staff take that blog away from me.